A newly-discovered backbone structure in a well-preserved 240-million-year-old fossil fish reveals an inflexible and slow swimmer, an evolutionary dead end.
A new study, part of National Geographic's Genographic Project, shows modern-day Uros people in Peru and Bolivia descended from the earliest settlers at Lake Titicaca.
These prolific fish are already widespread in stretches of the Illinois and Mississippi rivers, where they have severely overwhelmed native aquatic communities.
Shireen Gonzaga is a freelance writer who enjoys writing about natural history. She is also a technical editor at an astronomical observatory where she works on documentation for astronomers.